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    <title>4个小程序</title>
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    <div id="page">
        <article id="app1">
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                <span id="number">100</span>
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            <div class="actions">
                <button id="add1">+1</button>
                <button id="minus1">-1</button>
                <button id="mul2">*2</button>
                <button id="divide2">÷2</button>
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        </article>
        <article id="app2">
            <ol class="tab-bar">
                <li><span>1</span></li>
                <li><span>2</span></li>
                
            </ol>
            <ol class="tab-content">
                <li>作业太少了</li>
                <li>作业好少，练习题可以多点吗？学过记住不，头发掉的好多呀</li>
            </ol>
        </article>
        <article id="app3">
            <div class="squere"></div>
        </article>
        <article id="app4">
            <div class="circle"></div>
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